Building structure



FIG. 1 is an enlarged front perspective view of the building structure showing three sides thereof, as viewed from the center downward in FIG. 2.

FIG. 2 is a top plan view of the building structure of FIG. 1, however shown in its entirety; and,

FIG. 3 is an enlarged fragmented view of a portion of the building structure shown in FIG. 1.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a building structure, as shown and described. 